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NDA-24300 CHAPTER 7
Page 497
Issue 1
ROUTINE MAINTENANCE PROCEDURE
2. ROUTINE MAINTENANCE PROCEDURES
This section explains general routine maintenance procedures to be performed on a daily, monthly, and quar-
terly basis. Table 7-2 lists each procedure according to the time each procedure is to be performed. Use the
Reference Section to locate the detailed procedure.
Table 7-2 List of Routine Maintenance Procedures
TIME PROCEDURE REFERENCE SECTION REMARKS
Daily Check the temperature and relative humidity in
the switch room.
Section 2.1, Ambient Conditions
in Switch Room Check
Check to see if any of the alarm indicator lamps
on the TOPU are lit.
Section 2.2, Alarm Check
Check the operating status of the MAT and the
printer, remaining quantity of paper, etc.
Section 2.3, MAT/Printer Check
Check to see if a system message indicating a
fault is displayed.
Section 2.4, Collection of Sys-
tem Messages
Check whether any station is in lockout state. Section 2.5, Display of Locked-
out Station
Check whether the FANU is operating normally. Section 2.6, Fan Unit Check
Monthly Generate an alarm and check whether an indica-
tion appears on the TOPU.
Section 2.7, Alarm Tests
Check the conditions of the rectifier and batteries. Section 2.8, Main Power System
Check
Check trunk circuits individually. Also check the
RGU circuit in the PWR Supply of each
Module.
Section 2.9, Trunk RGU Check
Check each operation and lamps of DESKCON/
ATTCON.
Section 2.10, ATTCON/
DESKCON Check
Quarterly Check the CPU, TSW, and line/trunk Port Micro-
processors (PMs).
Section 2.11, System Check